Computer Science Course, Advanced Engineering Course, National Institute of Technology, Toyota College1
Department of Information and Computer Engineering, National Institute of Technology, Toyota College2
Department of Electrical and Electronic Engineering, National Institute of Technology, Toyota College3
The application of superconducting properties has been researched in worldwide such as motors in large scale. HTS application contributes suppression of CO2 to suppression energy and reduce of environmental load. For those applications, Magnetized HTS bulk or stack of HTS tape is one of the candidates to be installed for the field-pole magnet of rotating machine. Thanks to the high critical current density of HTS bulk, it is possible to improve the output efficiency and reduce the size of the motors. However, the output of the magnetic field produced by magnetized HTS bulk is difficult to emphasize in the electromagnetic (EM) design compared with HTS windings because it is strongly related with trapping property of superconductor and magnetizing environment of the HTS material itself. Therefore, before moving on to EM design of large-scale application, it is necessary to handle superconducting materials on simulation software to analyzes the model of the superconducting rotating machine and evaluates its performance. However, commercial EM simulation software cannot produce a solution reflected superconducting property.
In this research, a method for the superconducting calculation space into simulation software by introducing programmatic iterative calculation was proposed. T-A formulation, which is the method to provide space for both of electromagnetic and superconducting analysis are independently prepared in one analysis model, was implemented.
For the evaluation of the calculating method, an actual GdBa2Cu3O7 HTS bulk with a diameter of 46 mm was prepared as EM analysis model with ring-shaped coil component. The self-made program including superconducting property Jc-B curve of GdBa2Cu3O7 bulk adopted to T-A formulation was implemented in analysis model with Visual Basic Script (VBScript).
The magnetic flux field distribution of the HTS bulk model obtained after iterative convergence of the proposed method, has a conical shape as the distribution of magnetic flux density of HTS bulk measured in the previous work. As a result, we successfully produced the magnetic field of the bulk superconductor is reproduced by the proposed method
Keywords: Motor, Field pole, T-A formulation, electromagnetic analysis